Propeller



Nov. 2 1926.

P. P. GROSSO ET AL PROPELLER Filed August 31, 1925 INVENTORS GPOSSO x714.N I B Y 6 W/f/ Pg ATTORNEYS atented Nov. 2, 1926.

PATRICK P. GROSSO AND HARRY A. NEVV'KIRK, OF CHICAGO, ILLINOIS.

PROPELLER.

Application filed August 31, 1925. Serial No. 53,690.

Our invention relates to improvements in propellers for use particularlywith water and air craft, and it consist in the combinations,constructions and arrangements herein described and claimed.

An object of our invention is to provide ,a propeller in which thepropelling effect with blades of given dimensions is increased.

A further object of our invention is to.

provide a propeller in which the thrust in a propeller of given weightis increased.

A further object is to provide a propeller having blades in whichstreams of water are thrown rearwardly by centrifugal action, thusincreasing the propelling effect.

A further object is to provide a novel form of propeller blade which isof relatively light weight, and which may be used in connection withboats or air craft.

Other objects and advantages will appear 'in the followingspecification, and the novel features of the invention willbe*particularly pointed out in the appended claims.

Our invention is illustrated in the accompanying drawings, forming partof this application, in which v Figure 1 is a face view of thepropeller,

Figure 2 is a side view of one of the blades, showing the latter tippedat the normal angle for use,

Figure 3 is an edge view of the blade,

Figure 4 is a section along the line 44 of Figure 8, and

Figure 5 is a section long the line 5-5 of Figure 3.

Referring now to the drawings, we have shown blades having a bod portion1, which is preferably made 0 cast metal. This body portion, as will beobserved from Figure 3, is dish-shaped on one side, as shown at 2, andis convex on the side 3. The body portion is hollow. The general shapeof the hollow portion is shown in Figure 1. In this figure it will beobserved that there is an opening 4: in the front edge of the blade nearthe inner end thereof. This opening communicates with the dischargeopening 5,011 the dish-shaped side.

Connecting the opening 4 with theopening 5 is a passage 6, which iscurved in the manner shown in Figure 1, and which tapers from the edgeof the opening 4 to the opening 5. The wall of the passage 6 nearest thedish-shaped side follows the contour of said side, as shown in Figure 2,and the opposite wall follows in general the contour of the convex side3, as shown in Figure 3.

From the foregoing description of the various parts of the device, theoperation thereof may be readily understood. The propeller shown inFigure 1 is designed to rotate in the direction shown by the arrow, thatis, clockwise as viewed in the figure. Besides the ordinary propellingeffect which will be obtained by the face 2, water will be caused toenter the opening 4.- and will be forced through the opening 5 by thecentrifugal action of the blade. There will therefore be issuing fromeach of the openings 5 a stream of water which, as will be observed fromFigure 3, will be in a rear direction and substantially parallel withthe axis of the propeller. This rearward stream will react on the waterin which the propeller is submerged, and will cause an additional thrustto drive the boat or other craft forwardly.

blades provided with passages which permit the entrance of water neartheinner end of the blade, and which cause the water to be thrown outwardlyby centrifugal force,

and rearwardly to cause an: additional thrust, are contemplated asfalling within the scope of the invention.

We claim:

1. A propeller blade graduated in thick ness from the inner to the outerend, one face of said propeller blade being dishshaped and the oppositeface being convex, said blade having a relatively large opening in oneedge thereof near the inner end of the blade and having a relativelysmall discharge opening on the dish-shaped side, and a curved passagetapering from the large opening to the smaller opening.

2. A propeller blade graduated in thickness from the inner to the outerend, one face of said propeller blade being dish-shaped and the oppositeface being convex, said 5 blade having a relatively large opening in oneedge thereof near the inner end of the blade and having a relativelysmall discharge 0 ening on the (lish-shaped side, anol passage taperingfrom the large opening to the smaller opening, the central axis of thesmaller opening being substantially parallel with the axis of the proellei.

- PATRICK P. GROS

